CVE-2021-34371

Name: CVE-2021-34371
Creator: NVD / NIST
Published: 2021-08-05T20:15:09.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 13.39%

Last modified Jun 17, 2026

CVE-2021-34371 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Neo4j through 3.4.18 (with the shell server enabled) exposes an RMI service that arbitrarily deserializes Java objects, e.g., through setSessionVariable. An attacker can abuse this for remote code execution because there are dependencies with exploitable gadget chains.. EPSS estimates a 13.39% chance of exploitation in the next 30 days.

Description

Neo4j through 3.4.18 (with the shell server enabled) exposes an RMI service that arbitrarily deserializes Java objects, e.g., through setSessionVariable. An attacker can abuse this for remote code execution because there are dependencies with exploitable gadget chains.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

13.39%

95.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Neo4j	Neo4j	<= 3.4.18

References

https://www.exploit-db.com/exploits/50170Exploit, Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/50170Exploit, Third Party Advisory, VDB Entry

Timeline

Published: Aug 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34371?

How severe is CVE-2021-34371?

CVE-2021-34371 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 13.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34371?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34371?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST